#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_skip() while(*rp++>=48)
#define rd(v) ulong v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

#define WTHI(v) {ulong _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(ulong*)wp=_d;wp+=_n;}
#define WTLO(v) {ulong _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(ulong*)wp=_d;wp+=8;}
#define wt(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

typedef unsigned long ulong;
char*mmap();
char wbuf[1<<25];

int main(){
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	char*wp=wbuf;
	rd_skip();
	while(*rp){
		rd(a);
		rd(b);
		rd(cc);
		int c=cc-1;
		ulong d=1;
		for(int i=32;i--;){
			d*=d;
			d=c<0?d*10:d;
			d%=b;
			c<<=1;
		}
		ulong z=a*d%b*10/b;
		wt(z);
		*wp++='\n';
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}